showstopper vs attractiveness

showstopper and attractiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
showstopper	Yes	No	No	No
attractiveness	Yes	No	No	No

As nouns, attractiveness is a hypernym of showstopper; that is, attractiveness is a word with a broader meaning than showstopper:

showstopper: something that is strikingly attractive or has great popular appeal
attractiveness: the quality of arousing interest; being attractive or something that attracts

Other hypernyms of showstopper include attraction.

showstopper (noun)	attractiveness (noun)
something that is strikingly attractive or has great popular appeal	sexual allure
an act so striking or impressive that the show must be delayed until the audience quiets down	the quality of arousing interest; being attractive or something that attracts